Mechanism for converting rotary into reciprocating motion



(NO Model.)

A. LEWIS.

MECHANISM FOR OONVBRTING ROTARY INTO REGIPROGATING MOTION. No. 330,596. I Patented NOV. 17, 1885.

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ANDREW LEWIS, OF CANNON FALLS, MINNESOTA.

MECHANISM FOR CONVERTING ROTARY INTO RECIPROCATING MOTION.

SPECIFICATION forming part of Letters Patent No. 330.596, dated November 17, 1885. Application filed September 28, 1885. Serial No 178,416. (No model.)

To all whom, it may concern:

Be it known that I, ANDREW LEwIs, a citizen of the United States, and a resident of Cannon Falls, in the county of Goodhue and State of Minnesota, have invented certain new and useful Improvements in Mechanism for Converting Rotary into Reciprocating Motion; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in which- Figure 1 is a plan View of my improved mechanism for converting motion. Fig. 2 is a vertical transverse sectional view taken on the line as x in Fig. 1, and Fig. 3 is aside view of one of the yokes used in connection with my invention.

The same letters refer to thesame parts in all the figures.

This invention relates to mechanism for converting a rotary into a reciprocating motion; and it has for its object to provide a device of this class in which the motion from a single shaft, revolving in one direction continually, shall be applied to reciprocate one or more slides, the motion of which latter shall be comparatively slow, and consequently very powerful.

With these ends in View the invention consists in the improved construction, arrangement, and combination of parts,which will be hereinafter fully described, and particularly pointed out in the claim.

In the drawings hereto annexed, A designates a shaft, which is to be mounted in suitable bearings, and which is provided with a cylinder, B, in which are cut right and left hand screw-threads Oand D, intersecting each other, as shown, thereby forming on the face or periphery of the said cylinder a series of rhomboidal or diamond shaped projections E E. The screw-threads O D are terminated at some distance from the ends of the cylinder or shaft, the ends of which will thus be made to form collars F F, the inner edges of which are cut off, as at G G, on curved lines, but approximately parallel to the edges of the adjoining rhombs, as will be clearly seen in the drawings.

H H are blocks or slides, arranged to slide upon suitable ways, I I, parallel to the shaft A. Attached to theinner sides of these blocks or slides are yokes J, that straddle the shaft and engage the threads in the same, so that when the shaft is revolved the said yokes shall be caused to travel along the same. These yokes are preferably, but not necessarily, arranged to travel in opposite directions upon the shaft, and it is obvious that they must be of such a size and construction that they may readily pass each other without coming in contact with each other. When the yokes, in practice, have traveled the lengthof the shaft, they will come in contact with the points P of the collars F, which will tilt or bring the said yokes into the oppositely-cut threads, thus changing the direction of motion of the said yokes and the blocks attached thereto. It will thus be seen that by a continual rotary motion of the shaft in one direction a continuous reciprocating motion will be imparted to the slides, the screw acting in the nature of a worm, whereby a slow but powerful motion is secured. By cutting the threads of a different pitch the yokes, with their attachments, may be caused to travel in opposite directions at different rates of speed-a result which it is frequently exceedingly desirable to attain. The shaft A may be arrangedeither horizontally or vertically, and one, two, or even four of the yokes, with their attachments, may be used-by properly arranging the slideways and properly constructing and arranging the coacting parts.

Myimproved method of and mechanism for converting motion may be applied to a great variety of purposes, which it is not necessary to state in detail. I would have it particularly understood that inasmuch as, in practice, it may be often necessary or desirable to resort to changes in the construction and arrangement of parts, I do not wish to limit myself 5 to the precise construction and arrangement herein shown, but reserve to myself the right to all modifications which may be resorted to Without departing from the spirit of my invention.

IOO

Having thus described my invention, I claim and desire to secure by Letters Patent of the United States In mechanism for converting motion, constructed substantially as described, the operating shaft having oppositely cut screwthreads of different pitch intersecting each other, substantially as and for the purpose herein set forth.

In testimony that I claim the foregoing as my 10 own I have hereunto afii'xed my signature in presence of two witnesses.

hi ANDREW LEWIS.

nal'k.

Witnesses:

CHARLES PARKS, CHARLES J. TURNBERG. 

